97.9K reviews
Content rating
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About this app

K-9 Mail is an open source email client that works with basically every email provider.


* supports multiple accounts
* Unified Inbox
* privacy-friendly (no tracking whatsoever, only connects to your email provider)
* automatic background synchronization or push notifications
* local and server-side search
* OpenPGP email encryption (PGP/MIME)

Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP.


If you're having trouble with K-9 Mail, ask for help in our support forum at https://forum.k9mail.app

Want to help?

K-9 Mail is a community developed project. If you're interested in helping to improve the app, please join us! You can find our bug tracker, source code, and wiki at https://github.com/thunderbird/thunderbird-android
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
Updated on
Feb 29, 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

92.8K reviews
Phillip Honstein
December 5, 2023
Customizable, schedulable, sane, private. Handles multiple accounts, makes it easy to switch between accounts, has a unified Inbox to display all messages together, doesn't advertise to me, and displays all messages perfectly. It's just an email client, and a very good one. I didn't start using it until the Thunderbird folks took it over, and I wish I had tried it sooner.
46 people found this review helpful
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Darrell Short
January 26, 2024
It's a pleasant feeling being able to use one email client across multiple devices. In addition, the fact that it is being backed by Thunderbird is a huge plus. Set it up how you like, finds your account with ease. I am even using an IMAP and it found my information; it usually a nightmare because I would have to do it manually. UI can be a challenge, but still better than few I have used in the past.
22 people found this review helpful
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michael hamilton
February 17, 2024
For all of the complaints about this app, it is the ONLY one I could get to work with my IMAP email. Blue mail, Email, Full Email and Outlook all failed along with several others. Blue mail works for pop3, but not IMAP. I even copied and pasted all of settings from K9 to those other apps and they still couldn't connect to my mail server. I would like it better if I could collapse the folder tree in K9 like I can in Thunderbird.
4 people found this review helpful
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What's new

- Fixed settings import/export of identities without a name or description